Pneumatic hammer



C. H. HAESELER PNEUMATIC HAMMER.

APPLICATION FILED AUG.15,19I6.

Patented Mar. 22, 1921.

INVENTOR WITNESSES ATTORNEYS ares . TENT OFFICE.

CHARLES H. HAESELER, OF CHICAGO, ILLINOIS.

PNEUMATIC HAMMER.

Application filed August 15, 1916. Serial no. 114,948.

inder. In view of these numerous accidents,

which have arisen from this cause, many' of the States in this countryhave passed laws rendering it compulsory in devices of this character toemploy some means to prevent the accidental discharge of the iston fromthe cylinder or barrel of the too The cost of operation is alsoincreased, since the piston is sometimes injured and in many cases, suchas structural operation and bridge building, the working tool or pistonor both are lost and it is necessary to replace them.

It is therefore "also desirable to employ means to prevent the pistonand also the working tool, such as for example a rivet set, from beingforcibly ejected from the cylinder, and to the above ends, my presentinvention consists of novel means for preventing the accidentalremovalof the rivet set and the piston from the barrel of the workingtool.

It further consists of novel means for retaining-the working tool inassembled position,'whereby it maybe readily inserted and removed whendesired, and wherein if the pneumatic tool is not held to its work, theshank of the rivet set will be moved forwardly a suflicientdistance tobe out of the path of the piston, so that the latter cannot impactth'ereagainst.

It further consists of a novel construction I of a coupling sleeve bywhich the working tool is movably carried, and novel means for securinto the tool.

It further consists of a novel constructlon of a working tool and novelmeans cooperating therewith, whereby the accldental removal of theworking tool from the coupling sleeve is prevented.

It further consists of a novel construction of a coupling sleeve adaptedto be removably connected with the barrel of the tool and such couplingsleeve with respect arrel or cylin er of the pneumatic em loyed.

having a chamber in advance of the forward end of the barrel in which isadapted to reciprocate a split ring which is interlocked with the shankof the working tool.

Other novel features of construction and advantage will hereinafter moreclearly appear in the detaileddescription.

For the purpose of illustrating my invention, I have shown in' theaccompanying drawin s one form thereof which is at pres: ent preferredby me, since the same will give in practice satisfactory and reliableresults, although it is to be understood that thevariousinstrumentalities of which my invention consists can be variouslyarranged and organlzed and that my invention is not limited to theprecise arrangement and organization of these instrumentalities asherein shown and described.

Figure 1 represents a-side elevation, partly in section, of a pneumatictool in conjunct1on with which a retaining device for the working tool,embodying myinvention, is

1* 1g. 2 represents a sectlonal View, the section being taken on line2-2 of Fig. 1.

Fig. 3 represents a sectional view, the section being taken on line 33of Fig. 1.

Similar numerals of reference indicate corresponding parts in thefigures.

Referring to the drawings 1 designates a pneumatic tool of any desiredor conventional type, which is provided with a barrel 2 having a pistonchamher 3 in which is adapted to reciprocate a piston 4. The piston 4consists, in the present instance, of a cylindrical bolt having aforward extension or striker 5 of reduced diameter which is adapted topass through an aperture 6 in the barrel to impart its blows against theend of the shank 7 of a working tool 8, which for purpose ofillustration is illustrated as comprising a rivet set.

The aperture 6 is of less diameter than the piston chamber 3, therebyforming a shoulder 9, sothat the piston 4 cannot be ejected from thefront end of the barrel, but only from the rear end of the barrel afterthe handle 10 has been removed. The piston 4 is reciprocated in theusual manner by alternately passing motive fluid, such as for example,compressed air, to opposite ends of thepiston 4 to effect itsrec-iprocations.

. The forward end of the barrel 2, in the present instance, is ofreduced diameter, as indicated at 11, in order to receive the rearwardextension 12 of a coupling sleeve 13. the outer diameter of which ispreferably the same as that of the barrel 2. The coupling sleeve 13 isprovided with an intermediate portion 14 of less internal diam eterthan. the chamber of the rearward extension 12 and theforward end of thecoupling sleeve has a solid portion 15, which is apertured as at 16, inorder to receive the shank 7 which fits therein and also in a recess 17in the end of the barrel 2, said recess 17 communicating with theaperture 6.

The shank 7 of the working tool is provided with means to interlock witha split ring 18 and in order to illustrate one manner of accomplishingthis result, I have. shown the shank 7 as provided with an annulargroove 19 to receive such split ring. The differential bore of thecoupling sleeve 13 forms a shoulder 20 against which the end of thebarrel 2 preferably engages and when the parts are assembled, a chamber21 is formed in which the split ring 18 may reciprocate.

22 designates fastening devices, such as for. example, screws whichextend through the rearward extension 12 of the coupling sleeve 13 andwhich are in threaded engagement with the barrel 2, as will be readilyapparent from an inspection of Fig. 2.

28 designates a split band having a groove 24 at its inner periphery,said band being adapted to, be moved over the outer ends of thefastening devices 22, so as to prevent their loosening. It will be seenthat when the band 23 is removed, the fastening devices 22 may beloosened, so that the coupling sleeve 13 may be readily removed from thebarrel 2.

In the operation, the motive fluid admitted to the rear end of the fluidpressure operated tool, causes the piston to be advanced in thewell-known manner and the motive fluid passing from the forward end ofthe piston chamber 3 through the port or ports 25 and acting against ashoulder 26 on the piston, causes it to be returned to its initialposition at the rear end of the barrel. When the piston reaches the endof its forward stroke, .the forward extension or striker 5 impactsagainst the end of the shank 7 of the working tool 8. In case thepneumatic tool is not held to the work, it will be seen that this willcause the working tool to move forwardly so that the end of the shank 7is out of the path of the piston. The split ring 18 which is interlockedwith the shank 7 W111 engage the shoulder 26 and prevent the workingtool from being accidentally ejected from the barrel and the couplingsleeve.

When itis desired to remove the working tool, it is slmply necessary todraw the same outwardly in a proper manner, so that the split ring 18will become disengaged from its groove 19 and the working tool may thenbe readily removed. It will be seen that when a working tool is insertedin position. its shank will pass through the aperture 16 and through thesplit ring 18 which will abut against the forward end of the barrel 2 sothat the shank 7 will pass therethrough and the split ring willinterlock with the groove 19 of the piston.

It will be apparent that the broad principle of my invention is equallyapplicable to a long or short stroke riveter or other pneumaticimplement, which may be manually or mechanically held, and that the sameis applicable to other forms of rivet sets or other working tools thanthat shown. My novel device can be readily and cheaply manufactured, canbe quickly attached to and disconnected from the cylinder of the toolfor the purpose of inspection and repairs, and will be found to beefficient and reliable in operation under all conditions. In case it isdesired to renew or replace the split ring 18, this can be quickly andexpeditiously done upon the removal of the coupling sleeve. as isevident.

It will now be apparent that I have devised a novel and useful pneumatichammer, which embodies the features of advantage enumerated as desirablein the statement of the invention and the above description, and while Ihave. in the present instance, shown and described a preferredembodiment thereof which will give in practice satisfactory and reliableresults, it is to be understood that the same is susceptible ofmodification in various particulars without departing from the spirit orscope of the inention or sacrificing any of its advantages.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent. is

1. In a device of the character stated, a rivet set having a shoulderthereon, a shank extending rearwardly from said shoulder and having agroove therein, a split ring engaging said groove, and a coupling sleeveadapted to be secured to a tool cylinder, said coupling sleeve carryingsaid shank and having a chamber within which said split ringreoiprocates, said split ring being adapted to slide over said rivet setshank to interlock with said groove, whereby the shank of the rivet setwhen pushed into said cylinder will cause the ring to interlock with thegroove, and whereby said rivet set can be removed from said couplingsleeve without removing the coupling sleeve from the tool cylinder.

2. In a pneumatic hammer, the combination with a cylinder having at itsforward end an aperture to receive a working tool and an enlargedchamber intermediate the ends of said aperture forming a rear and aforward shoulder, of av working tool having its shank extending intosaid aperture and provided with an annular groove, and a split ringdetachably connected with the v walls of said-groove to reciprocate inunison working tool can be assembled with respect to said cylinder andremoved therefrom by relative longitudinal movement of the cylinder andworking tool.

3. In a pneumatic hammer, a cylinder, a tubular sleeve connected to theforward end of said cylinder and apertured to receive the shank of aworking tool and provided with a chamber of greater diameter than thediameter of said aperture, a working tool having its shank extendinginto said aperture, and a detachable member interlocked with said shankto move in unison with said shank with the same length of stroke as thelength of stroke of the working tool and to engage the forward Wall ofsaid chamber to prevent said working tool becoming disen-- gaged fromthe pneumatic hammer, said detachable member being adapted to slide overthe shank of the working tool into its locked position when the workingtool is in- 'serted into the c linder.

CHA LES H. HAESELER. Witnesses:

ERNEST REUBERTHY, FRANK E. GILES;

